Handling uniqueness constraints in a database system with...

Details Handling uniqueness constraints in a database system with... Handling uniqueness constraints in a database system with...

2005-12-05

2008-09-09

Wu, Yicun (Department: 2165)

Data processing: database and file management or data structures

Database design

Data structure types

C707S793000

Reexamination Certificate

active

07424495

ABSTRACT:
A version history of each of a plurality of resources is stored in a table. The version history for each resource comprises a set of one or more values for the resource, wherein each value in the version history of a resource indicates the value that the resource had in a particular version of the resource. In response to a request to perform an operation that causes a given resource that is subject to a uniqueness constraint to have a particular value, it is determined whether the uniqueness constraint is violated based on whether any version of any resource other than the given resource has the particular value. The uniqueness constraint is determined to be violated if any version of any resource other than the given resource has the particular value. The uniqueness constraint is not violated by existence of a version of the given resource that has the particular value.

REFERENCES:
patent: 5535386 (1996-07-01), Wang
patent: 7028057 (2006-04-01), Vasudevan et al.
patent: 7099899 (2006-08-01), Choy et al.
patent: 7143123 (2006-11-01), Tom et al.

Affiliated with

Also associated with

Rating

Handling uniqueness constraints in a database system with... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Handling uniqueness constraints in a database system with..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Handling uniqueness constraints in a database system with... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3984478